Abstract

Carrier dynamics of a quantum dotamplifier is studied using heterodyne pump-probe spectroscopy. Measurements of the recovery times versus injection current reveal a power law behavior predicted by a quantum dot rate equation model. These results indicate that Auger processes dominate the carrier dynamics.

Received 27 January 2007Accepted 16 February 2007Published online 20 March 2007

Acknowledgments:

The authors would like to acknowledge Christopher Roche and John Lucy for technical assistance. This study has been supported by Science Foundation Ireland (SFI) under Contract Nos. 01/FI/CO13 and 03/IN.1/1340, the Irish Research Council for Science, Engineering and Technology (IRCSET), through the Tyndall National Access Programme, and the Irish Higher Education Authority under the PRTLI program.